JPS63209333A - Information transmission equipment for vehicle - Google Patents

Abstract

PURPOSE:To attain two-way transmission with simple constitution by using a transmitter for transmission from a terminal equipment to a central controller in common by plural terminal equipments. CONSTITUTION:The transmitter 38 from a terminal equipment 30 to central controllers 5, 8 is used in common by plural equipments 30. In this case, the transmission of the signal from the equipment 30 to the controllers 5, 8 is divided into the random access transmission and the polling transmission. The fast random access transmission with fast response is applied to the signal outputted at any time from the equipment 30 and the polling transmission is used when the signal from the equipment 30 is required. Thus, one leakey cable 21 is in use to send an information signal efficiently in a short time.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problems to be solved by the invention E. Means for solving the problems (Fig. 1) F. Effect G. Example G1 Description of transmitting side G2 Terminal side Description 03 Explanation of random access transmission G4 Explanation of polling transmission H Effect of the invention A Industrial application field The present invention provides information transmission from a central control unit to a terminal device provided for each passenger seat in an airplane, train, bus, etc. The present invention relates to an information transmission device suitable for use in transmitting signals and the like as well as transmitting information signals and the like from a terminal device side.

B. Summary of the Invention The present invention is directed to transmitting information signals, etc. from a central control unit to a terminal device provided for each passenger seat of an airplane, train, bus, etc., and also transmitting information signals, etc. from the terminal device side. In the vehicle information transmission device capable of two-way communication, which is suitable for use, the number of transmitters can be reduced by sharing the transmitter for transmission from the terminal device to the central control device among multiple terminal devices. (In addition to being able to have a simple configuration, it is also possible to efficiently perform transmission from a plurality of terminal devices to the central control device side using a small number of transmission lines.

C. Prior Art For example, U.S. Pat. No. 4,584.603 shows the provision of separate video displays in passenger seats of vehicles such as aircraft. That is, video displays are individually provided in passenger seats, a plurality of video signals are transmitted in parallel to these video displays, and each video display selects and displays one of the signals.

D. Problems to be Solved by the Invention In this conventional device, multiple video signals are transmitted to each video display using independent transmission lines, and many transmission lines are required. It is.

Therefore, there is a problem that the wiring becomes complicated and the device becomes complicated.

In particular, if two-way communication is possible by transmitting information such as seat status from each video display to a control device that supplies video signals, more transmission lines will be required and the configuration will require more transmission lines. had become more complicated. In addition, aircraft have tended to become larger in recent years, for example, 500
It was nearly impossible to do this kind of wiring on an aircraft that had more than just seats.

In view of the above, an object of the present invention is to provide a vehicle information transmission device that has a simple configuration and is capable of bidirectional transmission.

E. Means for Solving the Problems The vehicle information transmission device of the present invention is illustrated in FIGS. 1 and 2, for example.
As shown in the figure, in an information transmission device in which a central control device (51, (8)) and a plurality of terminal devices (30) are connected for bidirectional communication, the terminal device (30) is connected to the central control device (5). The transmitter (3B) for transmission to , (8) is shared by a plurality of terminal devices (30).

F Function According to the vehicle information transmission device of the present invention, the terminal device (30
) to the central control unit +51. (Since the transmitter (38) for transmitting data to 30) to the central control unit 1151.+81 side is reduced, and transmission can be performed efficiently using fewer transmission lines.

G. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. This example is a video signal inside an aircraft.

This is a transmission device that transmits audio signals, etc.

Description of the G1 transmitting side First, the transmitting side as a central control device will be explained with reference to FIG. In FIG. 1, (1a) to (1d) are video tape recorders installed on the transmission side, such as in a crew cabin. The videotape recorder (1a) is for override use, and is loaded with a cassette tape in which information on how to put on a life jacket, etc. is recorded. Further, video tape recorders (1b) to (1d) are loaded with cassette tapes on which movies are recorded. These videotape recorders (
1a) to (1d) include a terminal V to which a reproduced video signal is output, and a terminal R to which a reproduced audio signal is output.

A is provided. These video tape recorders (1
a) to (1d) are compatible with two languages, terminals R and R are output terminals for the left audio signal and right audio signal in the language of the first country, respectively, and terminal A is the output terminal for the left audio signal and right audio signal in the language of the second country, respectively. This is an output terminal for monaural audio signals.

Further, (2) is a television tuner, and this television tuner (21) is provided with a terminal V to which a video signal is output, and a terminal R to which an audio signal is output. , are output terminals for the left audio signal and right audio signal, respectively.

In addition, (3) is a still image playback device, which plays compact discs, so-called CDs, on which maps, airport guide maps, etc. are recorded.
It is designed to play ROM. This still image reproducing device (3) is provided with a terminal V to which a still image video signal is output, and a terminal A to which an audio signal is output.

Further, (4a) and (4b) are audio playback machines each comprising three compact disc players (CD players) and three tape recorders;
) and (4b) are provided with six pairs of terminals R to which audio signals are output, respectively.

Terminals R and R are output terminals for the left audio signal and right audio signal, respectively.

Further, (5) is a control device, (5a) is a microphone, (5b) is a volume for adjusting the level of the audio signal from the microphone (5a), (5C) is an announce key, and (5d) is an override key. , (5e) ~
(5g) are video tape recorders (1b) to (1d), respectively.
) is a pause key to put the cursor into a pause state. Video signals obtained at terminals V and audio signals obtained at terminals R and A of the video tape recorders (1a) and (1b) are respectively supplied to a control device (5). The control device (5) is provided with an output terminal V for a video signal and an output terminal R, A for an audio signal, and these output terminals V
A video tape recorder (1b
), the video signal obtained at terminal V and the audio signal obtained at terminals R and A are output, but if the override key (
When pressing 5d) to turn on the override, the video signal obtained at terminal V and the audio signal obtained at terminals R and A of the video tape recorder (1a) are output. Also, when pressing the announce key (5c) to turn on the announcement, connect the microphone (5a) to output terminal A.
The audio signal from is output.

Further, (6) and (7) are CADA encoders used in a conventionally well-known cable digital audio/data transmission system (CADA system).

A CADA system, for example, is a system that time-division multiplexes multiple digital audio signals and transmits them using the band (6MHz) of one vacant CATV TV channel.
This is a system that can transmit music etc. extremely efficiently without sacrificing sound quality. CADA encoder (6) and (7)
is configured with an A/D converter and a shift register,
Time division multiplexing is performed by converting multiple audio signals into digital signals using an A/D converter, inputting them in parallel to predetermined positions of a shift register, and outputting them serially at high speed from this shift register. configured so that It should be noted that it is possible to multi-electrify not only digital audio (but also control data and computer software data).

Output terminal R of the control device (5) mentioned above.

The audio signal obtained at A is supplied to an encoder (6). In addition, the audio signals obtained at the output terminals R and A of the video tape recorders (1c) and (1d) are transmitted to the encoder (
6). Furthermore, the audio signals obtained at the output terminals R of the tuner (2) and the output terminal A of the still image player (3) are supplied to an encoder (6).

In addition, the audio signals obtained at 6 pairs of output terminals of the audio player (4a), 3 pairs of output terminals of R and the audio player (4b), and H are transmitted to the encoder (6) via the control device (5). ) and (7).

In addition, when the override key (5d), announce key (5c), or Bose key (5e) to (5g) of the control device (5) is pressed, the control device (5) sends the contents corresponding to the pressed key. control data SCz is generated, and this control data SCt is supplied to the encoder (6).

The encoder (6) is provided with output terminals A to E from which pause control signals are output in accordance with the control data SC1, and the pause control signals obtained at these output terminals A to E are used to control video tape recorders (LB), respectively. ) ~(l
d) The audio players (4a) and (4b) are controlled. That is, when the override key (5d) and the announce key (5c) are pressed, a pause control signal is output to the output terminals A-E, and the video tape recorders (1b) to
(ld), the audio playback devices (4a) and (4b) are all in a pause state. Also, Bose key (5e) ~ (5g)
When is pressed, pause control signals are output to output terminals A to C, respectively, and video tape recorders (1b) to (1
d) are respectively assumed to be Bose states.

Further, (8) is a master controller consisting of a computer that performs in-flight management, and this master controller (8) generates control data SC2 that controls the terminal device on the receiving side.
C2 is supplied to the encoder (6).

This control data SC2 is, for example, data requesting data indicating the state of the seat where the terminal device is installed.

In addition, (9a) is a ROM in which menu data is written.
, (9b) to (9h) are ROMs in which different game data is written. This ROM (9a) to (9h)
Computer software data S read out from
D is supplied to a signal processing circuit (10), and after addition of an error correction code, etc., is supplied to an encoder (7).

The control data SC1 and SC2 are also supplied from the encoder (6) to the encoder (7).

Further, the output terminal 0 of the encoder (6) is connected to a signal 5C which is the digitally converted plurality of supplied audio signals and a time-division multiplexed signal 5C of the control data SC1 and SC2.
A1 is obtained, and this signal 5cA1 is sent to the modulator (llf)
and is AM modulated using the VSB (vestigial sideband) method. Furthermore, the output terminal 0 of the encoder (7) receives a signal 5CA obtained by digitally converting the plurality of supplied audio signals, time-division multiplexed control data SCI, SC2, and computer software data SD.
2 is obtained, and this signal 5CA2 is supplied to the modulator (l1g) and subjected to AM modulation using the VSB method.

Furthermore, the video signal obtained at the output terminal (■) of the control device (5) is supplied to the modulator (lla), and the audio signal obtained at the output terminal A of the control device (5) is supplied to the modulator (lla). be done. Modulator (lla)
After the audio signal is FM modulated and frequency multiplexed with the video signal to make it similar to a normal television signal,
AM modulated using the VSB method.

Also, video tape recorders (LC), (LD)
.

Output terminal V of tuner (2) and still image player (3)
The video signals obtained are transmitted through modulators (llb) to (li
e) and is AM modulated using the VSB method.

Here, the modulators (lla) to (l1g) are configured to sequentially modulate frequency bands every two channels to prevent cross-modulation, for example, on 60 or more television broadcast channels.

Further, the output signals of the modulators (lla) to (l1g) are supplied to an adder (12) and frequency multiplexed. The frequency-multiplexed signal SMF from the adder (12) is supplied via a duplexer (13) to one end of a leaky cable (21) constituting a bidirectional signal transmission means. The other end of this leaky cable (21) is connected to a terminating resistor (22) for termination. This leaky cable (21) is, for example, a coaxial cable with a spiral cutout around it to increase the amount of signal leakage.

Explanation of the G2 terminal side Also, (30) is a terminal device that is installed individually in the passenger seat of the aircraft, and as shown in FIGS. 7 and 8, it is placed on the back of each passenger seat S. . The passenger seats S of the aircraft in this example are arranged in three rows on one side as shown in Fig. 8, and the three seats on one side form one set. 21) An antenna (31) is provided for capturing the frequency multiplexed signal SMF leaking from the antenna (31).The frequency multiplexed signal SMF captured by this antenna (31) is sent to the distributor (32b) via the demultiplexer (32a).
). This distributor (32b) divides the supplied frequency multiplexed signal SMF into three parts, and supplies each divided signal to a terminal device (30) provided corresponding to each seat S. Each terminal device (30) is configured as shown in FIG.
) and a CADA tuner (34).

The tuner (33) is configured to selectively receive channels in the output frequency bands of the modulators (lla) to (lie), and the tuner (34) is configured to selectively receive channels in the output frequency bands of the modulators (llf) and (Ilg). These tuners (33) and (34) are configured to be able to selectively receive channels.
) is controlled by the selection display device 4 (35).

Further, the video signal and audio signal output from the tuner (33) are supplied to the selection display device (35), and the time division multiplexed f-word 5CA output from the tuner (34)
I or 5CA2 is supplied to a CADA decoder (36). This CADA decoder (36) is supplied with C
Time division multiplexed signal 5CAI or 5 which is ADA data
Desired data is retrieved from CA2 and displayed on the selection display device (
35) or a personal computer (37) with this extracted data.

Further, FIG. 6 shows an example of the configuration of the panel surface of the selection display device (35), and this panel surface is arranged on the back of the passenger seat as shown in FIG. 7.

In FIG. 6, (35a) is a display device consisting of a flat cathode ray tube, liquid crystal display, etc., (35b) is an audio output terminal to which a hesodophone (35c) is connected, and (35d) is a joystick for games ( 35e) etc. (1st
(see figure) is the game terminal to which it is connected.

Also, (35f) is the TV selection key, (35g) is the music selection key, (35h') is the channel display, (35
i) is a channel down key, and (35j) is a channel up key. In this case, use the TV' selection key (35
f), then press the channel down key (35i) and the channel up key (35j) in sequence to change the television channel in sequence. That is, the reception channel at the TV tuner (33) and the CADA decoder (
36) The audio signal output from the display device (
35a) includes video tape recorders (1b) to (ld).
), the tuner (2), and the still image playback device (3) are sequentially displayed on the screen, and the corresponding audio signals are output to the audio output terminal (35b).

Here, when there are audio signals in two languages, two channels are assigned to one video signal screen, and the first channel is the audio signal in the language of the first country, and the second
In the channel, an audio signal in the language of the second country is output. Furthermore, the music channel can be changed in sequence by pressing the music selection key (35g), then pressing the channel down key (35i) and channel up key (35j) in sequence. That is, the audio signal output from the CADA decoder (36) is changed and the audio signal output terminal (35b
) has an audio player (4a).

The audio signals output from (4b) are sequentially output.

Also, (35k) is the menu display key, (3!M) is the cursor down key, (35m) is the cursor up key,
(35n) is the enter key. In this case, by pressing the menu display key (35k), a video signal based on data from the menu ROM (9a) is supplied from the personal computer (37) to the selection display device (35), and the menu is displayed on the display device (35a). The screen will be displayed. Then, by moving the cursor on the display screen using the cursor down key (357) or the cursor amplifier key (35m) to select a game, and then pressing the enter key (35n), the selected game ROM is selected from the personal computer (37). (9b) The video signal and audio signal based on the data from (9h) are selected and displayed on the display device (3
5), a game screen is displayed on the display device (35a), and a game sound true signal is outputted to the audio output terminal (35b).

Further, in FIG. 6, (35p) is a stewardess call key, (35q) is a reading light key, and (35r) is a volume adjustment volume.

Also, a frequency multiplexed signal S including control data SC2 sent from the master controller (8) to the leaky cable (21) via the CADA encoder (6).
The MF is captured by the antenna (31) of each terminal device (30) and supplied to the CADA tuner (34).

This CADA tuner (34) is a frequency multiplexed signal SM.
It receives the above-mentioned signal 5CAI which is CADA data from F and supplies it to the CADA decoder (36). This CADA decoder (36) is configured as shown in FIG.
) is supplied to the decoder (36b) via the CADA data input terminal (36a). This decoding section (36b) is
The microcomputer (36) included in the decoder (36)
c)) or the instructions included in the CADA data, the required predetermined data is extracted from the CADΔ data by 1!
LMJ and supplies it to the microcomputer (36c).

Further, the microcomputer (36c) is supplied with a selection signal from the selection display device (35) via the selection signal input terminal (36d) by operating each key, and is supplied with the selection signal included in the CADA data from the personal computer (37). A game data selection signal is input to the microcomputer (36c) via a game selection signal input terminal (36e).
). In addition, a microcomputer (36
c), various data signals such as demodulated audio are supplied to the selection display device (35) via the output terminal (36f), and data signals for the game fj[] are supplied to the output terminal (36g).
) is supplied to the personal computer (37).

Further, an address generator (36b) and a seat ID storage section (36i) are incorporated in this CADA decoder (36), and the address generator (36b) outputs information about the seat (or seat) on which this terminal device (30) is attached. This terminal device (30
) information on the installation position in the aircraft of the seat occupied by the user of seat 1 is supplied to the microcomputer (36c).
The microcomputer (36i) stores information about the seat to which this terminal device (30) is attached (or the seat on which the user of this terminal device (30) is seated), such as the manufacturing date and model. 36c).

In addition, a sensor (39) for detecting the state of this seat is connected to a microcomputer (36c), and the sensor (39) detects the seatbelt fastening state and the operating state of the reclining mechanism of this seat. Supplied to the computer (36c).

From this CADA decoder (36), a predetermined signal can be transmitted to a master controller (8) of the central control unit via a transmitter (38). In this example, the transmitter (38) is installed on one side of a set of three seats as shown in FIG.
) A transmission signal is supplied from the microcomputer (36c) of the CADA decoder (36) to the transmitter (38) via the transmission signal output terminal (36j).

In addition, the first
and second transmission request signal output terminal (36k) and (36
A transmission request signal is supplied to the transmitter (38) via J).

This transmission request signal is a high level signal "1" when you want to perform random access transmission, which will be described later, to the first output terminal (36k), and a high level signal "1" is obtained when you want to perform random access transmission, which will be described later, to the second output terminal (36J). At times, a high level signal "1" is obtained, and when no transmission request is made, a low level signal "0" is obtained at both output terminals.

A transmission consent signal is supplied from the transmission fi (3B) to this microcomputer (36c) via a consent signal input terminal (36m).

The transmitter (38) is equipped with a microcomputer (not shown) that controls transmission from each terminal device (30), and this microcomputer is equipped with a CAD eight de- header (
The above-mentioned transmission request signal is supplied from the microcomputer (36c) of the CADA decoder (36), and a transmission approval signal is supplied from this microcomputer to the microcomputer (36c) of the CADA decoder (36). Then, the microcomputer of the transmitter (38) determines the above-mentioned transmission request signal, and the transmission signal output terminal (38) determines the transmission request signal.
6j) superimpose a predetermined carrier wave on the transmitted signal obtained in
This superimposed transmission signal is output. In this example, as shown in Fig. 4, when the transmission request signal requests random access transmission, f1 (779,0MHz) is used as the carrier wave, and when the transmission request signal requests polling transmission, f1 is used as the carrier wave.
2 (779, 2MHz) is the carrier wave. The transmission signal on which the carrier wave has been superimposed is supplied from the output terminal (38a) of the transmitter (38) to the antenna (31) via the duplexer (32a), and from this antenna (31) to the leaky cable (21). transmit the signal to the central control unit via. A terminal device (30
) The signal supplied from the demultiplexer (13) is demultiplexed from other signals and then supplied to the demodulator (43).
The transmission signal demodulated by 43) is sent to the CADA encoder (6).
The encoder (6) supplies data based on the transmission signal from the terminal device (30) to the master controller (8).

Next, the operation when transmitting from each terminal device (30) to the central control device side via the transmitter (38) will be explained in the fifth section.
Let's explain with reference to the flowchart in the figure.

First, the seats in a set of three seats that share one transmitter (38) are numbered NO, 1, NO, 2, NO, and 3, respectively. At this time, the microcomputer of the transmitter (38) sequentially monitors the transmission request signals supplied from the terminal devices (30) of seats N001 to N0.3. At this time, for example, the first output terminal (36k
), when a transmission request signal with a high level signal "1" is supplied, the input terminal (3
6m).

The CADA decoder (36) immediately supplies a transmission signal to the transmitter (38) via the output terminal (36j) upon supply of this acceptance signal. In this transmitter (38), the transmission request signal is a signal (terminal (
36k), the above-mentioned carrier wave f1 is superimposed on this transmission signal to create a transmission signal, and this transmission signal is sent from the transmitter (38) to the center via the leaky cable (21). During this transmission, the CADA decoder (36c) continues to supply the transmission request signal (high level signal "1" from the terminal (36k) to the transmitter (38)). While transmitting the transmission signal from the terminal device (30) corresponding to the seat No. 081, even if there is a transmission request signal from the terminal device (30) corresponding to the seats No. 2, No. 3, The acceptance signal is not supplied to other terminal devices (30) until this transmission is completed.

Then, when the transmission request signal becomes a low level signal "0" and the transmission ends, the microcomputer of the transmitter (38) monitors the transmission request signal in order again. Then, terminal devices (30
) When a transmission request signal with a high level signal "1" is supplied, a consent signal is similarly supplied and transmission is performed.

In this way, transmission from one set of seats NO, 1, NO, 2, NO, 3 is performed by one transmitter (38).

Therefore, the transmitter (38) and antenna (31) required for this transmission device are 1/3 of the terminal device (30) (the configuration of the transmission device can be simplified accordingly. Although the signals were monitored in order, it is also possible to decide the order of priority among the three seats in advance.

03 Description of Random Access Transmission Next, description will be given of random access transmission in which signals are supplied from each terminal device (30) to the central control device side at any time in the transmission device of this example.

In this example, this random access transmission is performed using the steward desk call key (35p) of the selection display device (35).
and when the reading light key (35q) is operated. That is, when the steward desk call key (35p) of the selection display device (35) is pressed, the CADA decoder (36) is sent from the selection display device (35) via the input terminal (36d).
A steward desk call signal is supplied to the microcomputer (36c). When this steward desk call signal is supplied to the microcomputer (36c),
After outputting a high-level signal "1" as a transmission request signal from the output terminal (36k), when the acceptance signal is supplied, this steward descall signal and the address generator (36h) are output.
) and the address signal for this seat supplied from the transmitter (
38). Then, modulation is performed on a transmission signal using the carrier wave f1 for random access transmission described above, and this transmission signal is supplied to the output terminal (38a). Then, from this output terminal (38a) to the duplexer (32a)
and the leaky cable (21) via the antenna (31).
). This call signal is then supplied from the leaky cable (21) to the CADA encoder (6) on the central control unit side via the duplexer (13) and demodulator (43). Then, based on this signal, the switch box (40) is controlled by the CPU (not shown) in the CADA encoder (6), so that the steward desk call light (41) corresponding to the seat designated by the address signal is lit. It will be done. In addition, when the reading light key (35q) of the selection display device (35) is pressed, the selection display device (35)
From the input terminal (36d) to the CAD eight de-der (
A reading light lighting signal is supplied to the microcomputer (36C) of 36). When this lighting signal is supplied to the microcomputer (36c), it outputs a high level signal "1" from the output terminal (36k) as a transmission request signal, and upon supply of the consent signal, this lighting signal and address are generated. The seat address signal supplied from the transmitter (36h) is supplied to the transmitter (38).

Then, as in the case of the stewardess call signal described above, this lighting signal is modulated into a transmission signal by the transmitter (38), and this transmission signal is sent to the CADA encoder (6) of the central control unit via the leaky cable (21) or the like. ) and C
The switch box (40) is controlled by the CPU in the ADA encoder (6), and the reading light (42) corresponding to the seat indicated by the address signal is turned on. In this way, the designation by random access transmission is immediately transmitted, so the response is fast. However, when multiple terminal devices (30) transmit at the same time, the transmitted signals collide with each other and are disrupted, so that the command is not transmitted accurately, so the transmission is performed again after a predetermined period of time. It takes almost no time.

In particular, in this example, the transmitter (3
8), transmissions will not be transmitted from the three seats in one set at the same time (even if keys, etc. on the terminal device (30) are operated at the same time, transmissions will not be transmitted from the three seats in order). Therefore, the possibility that random access transmission signals from multiple seats will collide on the leaky cable (21), which is the transmission path, is reduced to approximately 1/3, and the number of retransmissions is reduced accordingly. The time required is reduced.

Explanation of G4 polling transmission Next, polling transmission in which signals are supplied from each terminal device (30) to the central controller side under the control of the central controller side in the transmission device of this example will be explained.

In this example, this polling transmission is carried out by the master controller (8) on the central control device side to each terminal device (30).
) and the condition of the seats. For example, master controller (8)
However, suppose you want to know whether the passengers in each seat are wearing their seat belts. At this time, control data SC2 is supplied from the master controller (8) to the CAD^ encoder (6) to request all terminal devices (30) to respond with seatbelt wearing information. At this time, since it is not possible to request responses from all the terminal devices (30) at the same time, the master controller (8) sequentially designates the addresses of the respective terminal devices (30) and outputs the control data SC2. For example, if there are 150 passengers on this airplane, specify in order the addresses of all the seats where these 150 passengers were seated.
Output control data SC2 150 times.

This control data SC2 is sent to the CAD 8 coder (
6), this control data SC2 is time-division multiplexed with other audio signals, etc., as described above, and becomes the signal 5.
CAI, and the signal 5CA1 which is this CADA data
is connected to each terminal bag fi via the leaky cable (21).
g(30). When this signal Sc^1 is supplied to the terminal device (30), the C of each terminal device (30)
In the ADA decoder (36), the control data SC in the CAD^ data demodulated by the decoding section (36b)
2 is determined by the microcomputer (36c).

As a result of this determination, if the address specified by the control data SC2 matches the address output by the address generator (36h) of this terminal device (30), then the microcomputer (36c) of this terminal device (30)
) outputs a seatbelt fastening information signal instructed by the control data SC2 to the transmitter (38). Note that this seatbelt wearing information is obtained from the sensor (39) as described above.
) is supplied to the microcomputer (36c).

Then, the transmitter (38) modulates the transmission signal using the carrier wave f2 for polling transmission, and sends this transmission signal to the output terminal (38d) of the transmitter (38) via the adder (38c). supply to. From this output terminal (38d), a duplexer (32) and an antenna (31) are connected.
) to the leaky cable (21). This seatbelt fastening information signal is then supplied from the leaky cable (21) via the duplexer (13) and fjEi device (43) to the CADA encoder (6) on the central control unit side, and from the CADA encoder (6). Supplied to the master controller (8). This master controller (8
) is supplied with the seat belt fastening information signal, the master controller (8
) outputs control data SC2 that requests a response regarding seatbelt fastening information.

In this way, the control data SC requests all terminal devices (30) to respond with seatbelt fastening information.
2 are output sequentially.

Terminal device (30) that corresponds to all seats in this way
By making the master controller (8) reply with the seatbelt fastening information, the master controller (8)
) side, it is possible to determine which passengers are wearing seat belts and which are not. Note that the time from when the master controller (8) outputs a signal to when a response is received is very short, so even if there are 150 seats, for example, polling transmission with all terminal devices (30) can be performed in a short period of time. be able to. Further, in the above example, the information grasped by the master controller (8) is the seat belt wearing information, but in addition to this, for example, the operating state of the reclining mechanism of each seat detected by the sensor (39), the selection display device (35) ) on the display device (35a), the selection state of the meal menu made by the passenger by operating the cursor keys, etc. on the selection display device (35), and the purchase request for in-flight sales made similarly by operating the cursor keys, etc. It is possible to collect and understand various information that can be detected by the microcomputer (36C), such as the selection status of items.

As described above, according to the transmission device according to this example, the terminal device (30
) to the central controller side is divided into random access transmission and polling transmission, and the signals output from each terminal device (30) at any time are random access transmissions with a quick response, and all terminal devices (30) ) By using polling transmission when a signal from the Since the transmission frequency is changed between polling transmission and polling transmission as shown in FIG. 4, random access transmission such as lighting control of a reading lamp (42) can be performed even during polling transmission.

In the above embodiment, one transmitter is shared by three seats, but it may be shared by two or more seats.

Further, although the above-described embodiments apply the present invention to an information transmission device inside an aircraft, it can be similarly applied to an information transmission device inside a vehicle such as a train or a bus. Furthermore, the present invention is not limited to the above-mentioned embodiments, and without departing from the gist of the present invention,
Of course, various other configurations are possible.

H Effects of the Invention According to the vehicle information transmission device of the present invention, a plurality of terminal devices share the transmitter that transmits data from each terminal device (30) to the central control device (51, (8+ side).
The structure is simplified, collisions of transmission signals are reduced, and fewer transmission lines are used for efficient transmission.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the vehicle information transmission device of the present invention, FIG. 2 is a block diagram showing the terminal device of the example in FIG. 1, and FIG. 4, 5, 6, 7, and 8 are diagrams for explaining the example in FIG. 1, respectively. (1a) to (1d) are video tape recorders, (2) is a television tuner, (3) is a still image player, (4a) and (4b) are audio players, (5) is a control device,
(6) and (7) are CADΔ encoders, (8) is a master controller, (9a) to (9h) are ROM,
(lla) to (l1g) are modulators, (12) is an adder, (13) and (32) are duplexers, (21) beam key cable, (30) is a terminal device, (31) is an antenna , (33) is the TV tuner, (34) is the CADA tuner, (35) is the selection display device, (35p) is the stewardess call key, (35q) is the reading light key, (
36) is a CADA decoder, (36b) is a decoding unit, (36c) is a microcomputer, (36j)
is a transmission signal output terminal, (36k) is a first transmission request signal output terminal, (36A) is a second transmission request signal output terminal,
(36m) is a consent signal input terminal, and (38) is a transmitter.

Claims (1)

[Claims] A plurality of terminal devices are provided corresponding to each seat in a vehicle,
In a vehicle information transmission device in which the plurality of terminal devices and a central control device are connected for bidirectional communication, a transmitter for transmission from the terminal device to the central control device is shared by the plurality of terminal devices. An information transmission device for a vehicle, characterized in that: